Lesson 2.5 Communication and Networks.pptx

Lesson 2.5 Communication and Networks.pptx
Your Interactive Guide to the Digital World Discovering Computers 2012 Chapter 9 Networks and Communications
Objectives Overview Discuss the purpose of the components required for successful communications and identify various sending and receiving devices Describe the uses of computer communications List advantages of using a network, and differentiate among LANs, MANs, and WANs Differentiate between client/server and peer-to- peer networks, and describe how a P2P network works Differentiate among a star network, bus network, and ring network Describe the various network communications standards Discovering Computers 2012: Chapter 9 2 See Page 459 for Detailed Objectives
Objectives Overview Explain the purpose of communications software Describe various types of lines for communications over the telephone network Describe commonly used communications devices Discuss different ways to set up a home network Describe various physical and wireless transmission media Discovering Computers 2012: Chapter 9 3 See Page 459 for Detailed Objectives
Communications • Computer communications describes a process in which two or more computers or devices transfer data, instructions, and information Discovering Computers 2012: Chapter 9 4 Page 460 Sending device Communications channel Receiving device
Communications Discovering Computers 2012: Chapter 9 5 Pages 460 – 461 Figure 9-1
Uses of Computer Communications Blogs Chat rooms E-mail Fax FTP Instant messaging Internet Newsgroups RSS Video conferencing VoIP Web Web 2.0 Web folders Wikis Discovering Computers 2012: Chapter 9 6 Page 462
Uses of Computer Communications • Users can send and receive wireless messages using wireless messaging services Discovering Computers 2012: Chapter 9 7 Pages 462 – 463 Figure 9-3
Uses of Computer Communications Text messaging (SMS) allows users to send and receive short text messages on a phone or other mobile device or computer Picture messaging allows users to send pictures and sound files Video messaging allows users to send short video clips Wireless instant messaging allows wireless users to exchange real-time messages with one or more other users Discovering Computers 2012: Chapter 9 8 Pages 463 - 464
Uses of Computer Communications • Wireless Internet access points allow people to connect wirelessly to the Internet from home, work, school, and in many public locations Discovering Computers 2012: Chapter 9 9 Pages 464 – 465 Figure 9-4
Uses of Computer Communications • A cybercafé is a coffeehouse, restaurant, or other location that provides personal computers with Internet access to its customers Discovering Computers 2012: Chapter 9 10 Page 466 Figure 9-5
Uses of Computer Communications • A global positioning system (GPS) is a navigation system that consists of one or more earth-based receivers that accept and analyze signals sent by satellites in order to determine the GPS receiver’s geographic location • GPS receivers are: Discovering Computers 2012: Chapter 9 11 Page 466 Built into many mobile devices Available as a handheld device Available with new vehicles
Discovering Computers 2012: Chapter 9 12 Page 467 Figure 9-6
Uses of Computer Communications Groupware • Helps groups of people work together on projects and share information over a network • Component of workgroup computing • Major feature is group scheduling Voice mail • Allows someone to leave a voice message for one or more people • Computer in voice mail system converts an analog voice message into digital form • A voice mailbox is a storage location on a hard disk in the voice mail system Discovering Computers 2012: Chapter 9 13 Page 467
Uses of Computer Communications • Many programs provide a means to collaborate, or work online, with other users connected to a server • Collaboration software includes tools that enable users to share documents via online meetings and communicate with other connected users Discovering Computers 2012: Chapter 9 14 Page 468 Online meetings Web conferences Document management systems
Uses of Computer Communications • Web services enable programmers to create applications that communicate with other remote computers over the Internet or on an internal business network • A mashup is a Web application that combines services from two or more sources Discovering Computers 2012: Chapter 9 16 Page 469 Figure 9-8
Networks • A network is a collection of computers and devices connected together via communications devices and transmission media • Advantages of a network include: Discovering Computers 2012: Chapter 9 17 Pages 470 - 471 Facilitating communications Sharing hardware Sharing data and information Sharing software Transferring funds
Networks • A local area network (LAN) is a network that connects computers and devices in a limited geographical area • A wireless LAN (WLAN) is a LAN that uses no physical wires Discovering Computers 2012: Chapter 9 19 Page 472 Figures 9-10 – 9-11
Networks • A metropolitan area network (MAN) connects LANs in a metropolitan area • A wide area network (WAN) is a network that covers a large geographical area Discovering Computers 2012: Chapter 9 20 Page 473 Figure 9-12
Networks • The design of computers, devices, and media on a network is sometimes called the network architecture Discovering Computers 2012: Chapter 9 21 Pages 473 – 474 Figures 9-13 – 9-14 Client/server network Peer-to-peer network
Networks • P2P describes an Internet network on which users access each other’s hard disks and exchange files directly over the Internet Discovering Computers 2012: Chapter 9 22 Page 475 Figure 9-15
Networks • A network topology refers to the layout of the computers and devices in a communications network Discovering Computers 2012: Chapter 9 23 Pages 475 – 477 Figures 9-16 – 9-18 Star network Bus network Ring network
Networks An intranet is an internal network that uses Internet technologies An extranet allows customers or suppliers to access part of its intranet Discovering Computers 2012: Chapter 9 24 Page 477
Network Communications Standards Ethernet Token ring TCP/IP Wi-Fi Bluetooth UWB IrDA RFID WiMAX WAP Discovering Computers 2012: Chapter 9 25 Page 477
Network Communications Standards Ethernet is a network standard that specifies no computer controls when data can be transmitted The token ring standard specifies that computers and devices on the network share or pass a special signal (token) TCP/IP is a network standard that defines how messages are routed from one end of a network to another Discovering Computers 2012: Chapter 9 26 Page 478
Network Communications Standards • Wi-Fi identifies any network based on the 802.11 standard that facilitates wireless communication • Sometimes referred to as wireless Ethernet Discovering Computers 2012: Chapter 9 28 Page 479 Figure 9-20
Network Communications Standards • Bluetooth defines how two Bluetooth devices use short- range radio waves to transmit data • UWB (ultra-wideband) specifies how two UWB devices use short-range radio waves to communicate at high speeds • IrDA transmits data wirelessly via infrared (IR) light waves • RFID uses radio signals to communicate with a tag placed in or attached to an object, animal, or person Discovering Computers 2012: Chapter 9 29 Pages 480 - 481
Network Communications Standards WiMAX (802.16) • Developed by IEEE • Towers can cover a 30-mile radius • Two types are fixed wireless and mobile wireless • Provides wireless broadband Internet access Wireless Application Protocol (WAP) • Specifies how some mobile devices can display the content of Internet services • Web • E-mail • Chat rooms • Uses a client/server network Discovering Computers 2012: Chapter 9 31 Page 482
Communications Software • Communications software consists of programs that: Discovering Computers 2012: Chapter 9 32 Page 482 Help users establish a connection to another computer or network Manage the transmission of data, instructions, and information Provide an interface for users to communicate with one another
Communications Over the Telephone Network • The public switched telephone network (PSTN) is the worldwide telephone system Discovering Computers 2012: Chapter 9 33 Pages 482 – 483 Figure 9-23
Communications Over the Telephone Network Dial-up lines Dedicated line ISDN line DSL FTTP T-carrier line ATM Discovering Computers 2012: Chapter 9 34 Pages 483 - 485
Communications Over the Telephone Network Discovering Computers 2012: Chapter 9 35 Page 483 Figure 9-24
Communications Over the Telephone Network • ADSL connections transmit data downstream at a much faster rate than upstream Discovering Computers 2012: Chapter 9 36 Page 484 Figure 9-25
Communications Devices • A communications device is any type of hardware capable of transmitting data, instructions, and information between a sending device and a receiving device • A dial-up modem converts signals between analog and digital Discovering Computers 2012: Chapter 9 37 Page 485
Communications Devices • A digital modem sends and receives data and information to and from a digital line Discovering Computers 2012: Chapter 9 38 Page 486 DSL modem Cable modem
Communications Devices Discovering Computers 2012: Chapter 9 39 Page 486 Figures 9-26 – 9-27
Communications Devices • A wireless modem uses the cell phone network to connect to the Internet wirelessly from a notebook computer, a smart phone, or other mobile device Discovering Computers 2012: Chapter 9 40 Page 487 Figure 9-28
Communications Devices • A network card enables a computer or device to access a network • Available in a variety of styles • Wireless network cards often have an antenna Discovering Computers 2012: Chapter 9 41 Page 487 Figure 9-29
Communications Devices • A wireless access point is a central communications device that allows computers and devices to transfer data wirelessly among themselves or to a wired network Discovering Computers 2012: Chapter 9 42 Page 487 Figure 9-30
Communications Devices • A router connects multiple computers or other routers together and transmits data to its correct destination on a network • Many are protected by a hardware firewall Discovering Computers 2012: Chapter 9 43 Page 488 Figure 9-31
Communications Devices • A hub or switch connects several devices in a network together Discovering Computers 2012: Chapter 9 44 Pages 488 – 489 Figure 9-32
Home Networks Discovering Computers 2012: Chapter 9 45 Page 489 • Home networks provide computers with the following capabilities: Connect to the Internet at the same time Share a single high- speed Internet connection Access files and programs on other computers Share peripherals Play multiplayer games Connect game consoles to the Internet Subscribe to and use VoIP
Home Networks • Types of wired home networks: Discovering Computers 2012: Chapter 9 46 Page 489 Ethernet Powerline cable Phoneline
Communications Channel • The amount of data that can travel over a communications channel sometimes is called the bandwidth • Latency is the time it takes a signal to travel from one location to another on a network • Transmission media carries one or more signals • Broadband media transmit multiple signals simultaneously Discovering Computers 2012: Chapter 9 48 Page 491 Figure 9-34
Discovering Computers 2012: Chapter 9 50 Page 493 Figures 9-36 – 9-38 Twisted-pair cable
Discovering Computers 2012: Chapter 9 51 Page 493 Figures 9-36 – 9-38 Coaxial cable
Discovering Computers 2012: Chapter 9 52 Page 493 Figures 9-36 – 9-38 Fiber-optic cable
Wireless Transmission Media • Cellular radio is a form of broadcast radio that is used widely for mobile communications Discovering Computers 2012: Chapter 9 54 Pages 494 - 495 Figure 9-40
Wireless Transmission Media • Microwaves are radio waves that provide a high- speed signal transmission Discovering Computers 2012: Chapter 9 55 Page 496 Figure 9-41
Wireless Transmission Media • A communications satellite is a space station that receives microwave signals from an earth-based station, amplifies it, and broadcasts the signal over a wide area Discovering Computers 2012: Chapter 9 56 Page 496 Figure 9-42
Video: Got Your Video Right Here Discovering Computers 2012: Chapter 9 57 CLICK TO START
Summary Overview of communications terminology and applications How to join computers into a network Various communications devices, media, and procedures Discovering Computers 2012: Chapter 9 58 Page 497
Your Interactive Guide to the Digital World Discovering Computers 2012 Chapter 9 Networks and Communications Chapter 9 Complete
Discovering Computers 2012: Chapter 9 60
9A-61 Project due Nov. 16 • Play the game of FreeCell. • small number on next larger number and alternating color • e.g. Heart Queen on Club King and Spade Jack on Heart Queen • goal: to throw all cards to destination pile • current smallest number of the suit: can be thrown to destination pile • any card can be moved to empty line (stack) • any card can be moved to temporary work space (TMP) • Print every step. • Your last two digits + 1000 are the game number you have to solve. • Game #617: • HQ  CK, S2  TMP, SJ  HQ, C10  DJ, HK  TMP, HK  Line8, • SK  TMP, S10  TMP, SQ  HK, HJ  SQ, S10  HJ, H4  TMP, • D5  C6, H9  S10, C3  TMP, D9  C10, C3 throw, S3  TMP, • H4  Line4, S3  H4, D4  TMP, D3  TMP, D2  S3, C10  Line7, • H5  TMP, DJ  CQ, S4  D5, C4 throw, D3  S4, CQ  DK, • C10  DJ, S7  TMP, SK  Line7, HQ  SK, D4 throw, S3 throw, • S4 throw, H5  C6, CK  TMP, C9  TMP, S9  TMP, CK  Line4, • DQ  CK, CJ  DQ, C7 throw, H6 throw, S8  H9, H7  S8, • S6  H7, D6 throw, S8 throw, S9 throw, CQ  Line2, DK  TMP, • H10  TMP, D10  TMP

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